Application of Experimental Design in Gas Well Completion String Selection
Received date: 2011-12-29
Revised date: 2012-05-24
Online published: 2012-08-10
When the acid fracturing production integrated string is used in a deep well with high temperature and high pressure,it is necessary to avoid the small size or large size pipe diameter.The big wellhead working pressure which is produced by big friction resulted from small tubing size will take wellhead safety risk when the pipe diameter is very small;the poor ability of wellbore loading liquid will make the gas well quit flowing earlier than expected while the pipe diameter is very large.Thus,it is required to select the reasonable selection of tubing string.In this paper,we use the experiment design software to optimize four main parameters of tubing string composition,well depth,construction displacement and fracture propagation pressure gradient which affect gas well wellhead working pressure.Then we calculate the wellhead working pressures based on the designed 14 parameter combination,and get the regression equation for wellhead working pressure.Finally we obtain the wellhead working pressure curve for different parameter combinations by using experimental design.It is advantage to intuitively choose tubing string.The average percent difference is 0.24% between model result and the actual value.So,the experimental design is available to calculate the wellhead working pressure resulted from different parameters,to perform sensitivity analysis,and to design tubing string for new well.
LIU Zhi-sen,JIANG Hou-shun . Application of Experimental Design in Gas Well Completion String Selection[J]. Natural Gas Geoscience, 2012 , 23(4) : 780 -783 . DOI: 10.11764/j.issn.1672-1926.2012.04.780
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